LES Analysis of Flow and Turbulence Mixing in an Unsteady Jet

The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence intensity on the turbulent eddy structure and mixing process between nozzle fluid and ambient fluid were investigated. The results show that tor...

Full description

Saved in:
Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 72; no. 721; pp. 2265 - 2270
Main Authors KAWANABE, Hiroshi, KAWASAKI, Kiyoshi, SENO, Toshio, KONDO, Chihiro, SHIOJI, Masahiro
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 2006
Subjects
Computational Fluid Dynamics
Entraining Flow
Jet
Large Eddy Simulation
Turbulent Mixing
Unsteady Flow
Online AccessGet full text

Cover

More Information
Summary:The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence intensity on the turbulent eddy structure and mixing process between nozzle fluid and ambient fluid were investigated. The results show that toroidal-shape vortex, which is growing up around jet tip, mainly accelerate the entraining flow. Also, increasing the turbulence intensity in the nozzle encourages the mixing in the jet without change of the jet-contour. Furthermore, when the rise-up time of initial nozzle velocity is elongated, turbulent mixing is suppressed.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.72.2265